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J. Exp. Med.,
Volume 188, Number 9, November 2, 1998 1651-1656
Derived from CD4+ T Cells Is Sufficient
to Mediate T Helper Cell Type 1 Development
By


From the * Department of Medicine and the Department of Microbiology/Immunology, and the Interferon
Howard Hughes Medical Institute, University of California San Francisco, San Francisco, California
94143; and the § Veterans Administration Medical Center, San Francisco, California 94121
(IFN-
) has been implicated in T helper type 1 (Th1) cell development through
its ability to optimize interleukin 12 (IL-12) production from macrophages and IL-12 receptor
expression on activated T cells. Various systems have suggested a role for IFN-
derived from
the innate immune system, particularly natural killer (NK) cells, in mediating Th1 differentiation in vivo. We tested this requirement by reconstituting T cell and IFN-
doubly deficient
mice with wild-type CD4+ T cells and challenging the mice with pathogens that elicited either
minimal or robust IL-12 in vivo (Leishmania major or Listeria monocytogenes, respectively). Th1
cells developed under both conditions, and this was unaffected by the presence or absence of
IFN-
in non-T cells. Reconstitution with IFN-
-deficient CD4+ T cells could not reestablish control over L. major, even in the presence of IFN-
from the NK compartment. These
data demonstrate that activated T cells can maintain responsiveness to IL-12 through elaboration of endogenous IFN-
without requirement for an exogenous source of this cytokine.
;
natural killer cells;
Leishmania;
Listeria
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